FixedHighlight.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / FixedHighlight.cs / 1305600 / FixedHighlight.cs
                        
                        
                            //---------------------------------------------------------------------------- 
// 
//      Copyright (C) 2003 by Microsoft Corporation.  All rights reserved.
// 
// 
// Description:
//      Implements FixedHighlight 
// 
// History:
//      1/11/2004 - Zhenbin Xu (ZhenbinX) - Created. 
//
//---------------------------------------------------------------------------
namespace System.Windows.Documents
{ 
    using MS.Internal.Documents;
    using System; 
    using System.Collections.Generic; 
    using System.Diagnostics;
    using System.Windows.Media;                 // Brush 
    using System.Windows.Media.TextFormatting;  // CharacterHit
    using System.Windows.Shapes;                // Glyphs
    using System.Windows.Controls;              // Image
 

 
    //===================================================================== 
    /// 
    /// FixedHighlight represents partial glyph run that is highlighted on a fixed document. 
    /// 
    internal sealed class FixedHighlight
    {
        //------------------------------------------------------------------- 
        //
        // Connstructors 
        // 
        //----------------------------------------------------------------------
 
        #region Constructors
        /// 
        ///    Create a new FixedHighlight for a Glyphs with character offset of
        ///    beginOffset to endOffset, to be rendered with a given brush. 
        /// 
        internal FixedHighlight(UIElement element, int beginOffset, int endOffset, FixedHighlightType t, 
                                Brush foreground, Brush background) 
        {
            Debug.Assert(element != null && beginOffset >= 0 && endOffset >= 0); 
            _element = element;
            _gBeginOffset = beginOffset;
            _gEndOffset = endOffset;
            _type = t; 
            _foregroundBrush = foreground;
            _backgroundBrush = background; 
        } 
        #endregion Constructors
 
        //-------------------------------------------------------------------
        //
        // Public Methods
        // 
        //----------------------------------------------------------------------
 
        #region Public Methods 
        /// 
        /// Compares 2 FixedHighlight 
        /// 
        /// the FixedHighlight to compare with
        /// true if this FixedHighlight is on the same element with the same offset, and brush
        override public bool Equals(object oCompare) 
        {
            FixedHighlight fh = oCompare as FixedHighlight; 
 
            if (fh == null)
            { 
                return false;
            }

            return (fh._element == _element) && (fh._gBeginOffset == _gBeginOffset) && (fh._gEndOffset == _gEndOffset) && (fh._type == _type); 
        }
 
        ///  
        /// Overloaded method from object
        ///  
        /// Hash code
        public override int GetHashCode()
        {
            return _element == null ? 0 : _element.GetHashCode() + _gBeginOffset + _gEndOffset + (int)_type; 
        }
        #endregion Public Methods 
 
        //--------------------------------------------------------------------
        // 
        // Public Properties
        //
        //---------------------------------------------------------------------
 

        //-------------------------------------------------------------------- 
        // 
        // Public Events
        // 
        //---------------------------------------------------------------------


        //------------------------------------------------------------------- 
        //
        // Internal Methods 
        // 
        //---------------------------------------------------------------------
 
        #region Internal Methods

        // Compute the rectangle that covers this highlight
        internal Rect ComputeDesignRect() 
        {
            Glyphs g = _element as Glyphs; 
            if (g == null) 
            {
                Image im = _element as Image; 
                if (im != null && im.Source != null)
                {
                    return new Rect(0, 0, im.Width, im.Height);
                } 
                else
                { 
                    Path p = _element as Path; 
                    if (p != null)
                    { 
                        return p.Data.Bounds;
                    }
                }
 
                return Rect.Empty;
            } 
 
            GlyphRun run = g.MeasurementGlyphRun; // g.ToGlyphRun();
            if (run == null || _gBeginOffset >= _gEndOffset) 
            {
                return Rect.Empty;
            }
 
            Rect designRect = run.ComputeAlignmentBox();
            designRect.Offset(g.OriginX, g.OriginY); 
 
            int chrct = (run.Characters == null ? 0 : run.Characters.Count);
 
            Debug.Assert(_gBeginOffset >= 0);
            Debug.Assert(_gEndOffset <= chrct);

            double x1, x2, width; 

            x1 = run.GetDistanceFromCaretCharacterHit(new CharacterHit(_gBeginOffset, 0)); 
 
            if (_gEndOffset == chrct)
            { 
                x2 = run.GetDistanceFromCaretCharacterHit(new CharacterHit(chrct - 1, 1));
            }
            else
            { 
                x2 = run.GetDistanceFromCaretCharacterHit(new CharacterHit(_gEndOffset, 0));
            } 
 
            if (x2 < x1)
            { 
                double temp = x1;
                x1 = x2;
                x2 = temp;
            } 
            width = x2 - x1;
 
            if ((run.BidiLevel & 1) != 0) 
            {
                // right to left 
                designRect.X = g.OriginX - x2;
            }
            else
            { 
                designRect.X = g.OriginX + x1;
            } 
 
            designRect.Width = width;
 
#if DEBUG
            DocumentsTrace.FixedTextOM.Highlight.Trace(string.Format("DesignBound {0}", designRect));
#endif
            return designRect; 
        }
        #endregion Internal Methods 
 

        //-------------------------------------------------------------------- 
        //
        // Internal Properties
        //
        //--------------------------------------------------------------------- 

        #region Internal Properties 
        internal FixedHighlightType HighlightType 
        {
            get { return _type; } 
        }

        internal Glyphs Glyphs
        { 
            get { return _element as Glyphs; }
        } 
 
        internal UIElement Element
        { 
            get { return _element; }
        }

        internal Brush ForegroundBrush 
        {
            get 
            { 
                return _foregroundBrush;
            } 
        }

        internal Brush BackgroundBrush
        { 
            get
            { 
                return _backgroundBrush; 
            }
        } 

        #endregion Internal Properties

        //-------------------------------------------------------------------- 
        //
        // Private Fields 
        // 
        //----------------------------------------------------------------------
 
        #region Private Fields
        private readonly UIElement _element;             // the Glyphs element, or possibly an image
        private readonly int _gBeginOffset;  // Begin character offset with Glyphs
        private readonly int _gEndOffset;    // End character offset with Glyphs 
        private readonly FixedHighlightType _type;  // Type of highlight
        private readonly Brush _backgroundBrush; // highlight background brush 
        private readonly Brush _foregroundBrush; // highlight foreground brush 
        #endregion Private Fields
    } 

    /// 
    /// Flags determine type of highlight
    ///  
    internal enum FixedHighlightType
    { 
        None = 0, 
        TextSelection = 1,
        AnnotationHighlight = 2 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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FixedHighlight.cs source code in C# .NET

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